Using the copy() method, you can simulate coloring an image in by copying an image of the colored image on top of the black-and-white image wherever the cursor is dragged.
Copy Image Data: Revised by Kasey Lichtlyter. Edited and maintained by p5.js Contributors and Processing Foundation. Licensed under CC BY-NC-SA 4.0.
You can find the code history of these examples here: 2023 code, pre-2023 code. You can suggest improvements by contributing to the current website!
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